Strainer



June' 8, '1937. w. CZARNECKI STRAINER 2 Sheets-Sheet 1 Filed May 23, 1955 INVENTOR: Win Tm Lkqqmmy L ATTORNEY ITNESSES:

June 8, 1937. w. CZARNECKI STRAINER Filed May 23, 1935 2 Sheets-Sheet 2 INVENTOR: Ezxgma I ATTORNEY muss? v Patented June 8, 1937 PATENT OFFICE STRAINER Walter Czarnecki, Eddington, Fa, assignor, by

mesne assignments, to Eddington Metal Specialty 00., Eddington, Pa., a firm Application May 23, 1935, Serial No. 22,973

2 Claims.

This invention has to do with the art of strainers and is concerned more particularly with that type of strainer designed to strain fluid which is supplied under pressure. Such strainers are commonly employed to purify the oil which is pumped to oil burners. It is common practice today to employ the so-called basket-type strainer for the above noted purpose. Such a strainer comprises a basket of a filtering medium, such as metallic gauze, and which basket is affixed to a plate that is fastened in a casing, the cover of the casing being designed to hold the basket in place. Suitable threaded openings are provided in the casingfor connecting the same to an oil line.

At the presenttime, considerable difficulty is being experienced in connection with the use of the now known devices of this character in that the straining areas afforded by the conventional type basket become clogged and covered With foreign material very quickly.

With the above noted condition in mind, this invention has in view as its primal object, the provision of a straining device, including a plurality of straining baskets, whereby an increased area in the straining medium is afforded. In carrying out this broad objective in a practical embodiment, certain conditions present themselves which must be accommodated in order to provide a strainer that will meet with commercial acceptance. In the first place, it is important that the casing housing the straining medium be of substantially the same shape and size as those now commonly in use, and it is' also of importance that the requirements of the underwriters with respect to properly supporting the straining baskets are fulfilled.

In order to provide a plurality of straining baskets, as above noted, this invention contemplates availing of baskets of non-circular forma tion that are characterized by having side walls spaced a slight distance apart and integrally joined together by end walls, the side walls being of comparatively large area.

Another object in connection with the use of filtering baskets of this type, is to provide a plurality of such baskets, each of which is disposed with the sides having a, greater area parallel to the path of the flow of the fluid which is being strained.

Under certain conditions and usage, the flow of oil through the straining device is from the outside of the baskets to the interior thereof. As the fluid is ordinarily pumped under pressure, a clogging of the surface of the straining medium might result in the collapsing and crumpling of the baskets. Hence, this invention has, as a further objective, the provision of non-circular filtering baskets of the above noted type, together with means positioned in the baskets for preventing their collapse.

A further object of the invention is to provide, in a straining device of the above noted type, a plurality of straining baskets, each of which is supplied with a supplemental filtering means which may take the form of an outer casing of fabric and which is removably attached to the individual baskets.

Still another object of the invention is the provision of a straining device which a cylindrical basket of conventional construction and with which is associated a plurality of noncircular baskets, of the type above noted, which are disposed interiorly of the first mentioned basket and which would ordinarily be of a finer mesh.-

tion comprises a casing of conventional design having a base plate anchored therein in the wellknown manner, with a plurality of narrow filtering baskets anchored on the base plate and depending therefrom, the baskets being disposed with their larger sides parallel to the path of flow of the fluid through the casing. Each of the baskets may be covered with a straining fabric.

For a full and more complete understanding of the invention, reference may be had to the following description and accompanying drawings wherein:

Figure 1 is a vertical section taken through a straining device made in accordance with the present invention,

Figure 2 is a detailed illustration in perspective of a base plate designed to accommodate a plurality of the straining baskets.

Figure 3 is a plan view of a base plate of a somewhat modified form, while Figure 4 is a section through a basket assembly connected to the base plate shown in Figure 3. This view is taken about on the plane reprebly shown in Figure 5, this view being taken about includes on a line represented by line 6-6 of Figure 5,

, and

being provided with an enlarged portion I4 that has a threaded opening I5 designed to connect the casing to the conduit through which fluid to be strained flows. Opposite to the opening I5 a side wall I3 is provided with a similarly en larged portion I6 having the threaded opening I! that connects the straining device to the conduit which is to be supplied with the strained .fluid. The upper portions of the side walls I3 are enlarged as indicated at I8 and an opening I9 extends vertically through this enlarged portion I8 to communicate with the opening IT.

A cover 29 has an offset portion 2I that provides a recess 22 that communicates with the opening I3 when the cover is assembled on the casing, and also with the interior of the casing. This cover 23 is held in position on the casing by means of the threaded bolts indicated at 23. Interposed between'the cover 20 and the casing A is a plate referred to generally by the reference character B, there being packing gaskets on each side of the plate 13 as shown at 24 and 25.

one form whichthe plateB maytake is there illustrated. This plate has openings 25 through which-the threaded bolts 23 pass in positioning the cover 20 and the plate to the casing A. An opening 21 of'substantially the same size as the opening 26 is provided and when the parts are assembled, this opening is in alignment with the opening I 9. .A small opening '28 is also formed in thebase plate B merelyas a guide to insure The central portion of the base plate B is formed 'with a circular part 29 that is spaced from the plane of the main body of the plate by a circular wall shown at 30. This circular part 29 is formed with a plurality 'of openings which are long and narrow in shape, being designated 3|, while the openings on the side are referred to as 32, each of the latter having a side wall conforming to thecurvature of the circular part 29. When the plate is positioned in the assembly, these long, narrow openings will extend lengthwise of the path of'the flow of fluid through the casing A. i

Depending from each of the openings 3| and 32. is a basket 33 which maybe made from any suitable straining or filtering material, such as a metallic gauze. -I prefer to employ a strainer made of Monel metal. The baskets 33 are of such shape that a horizontal cross-section thereof will conform to the formation of the opening 3I or 32 to which this open end is connected.

"This latter connection is effected by passing the open end of the basket a slight distance through this'opening 3| or 32 and then peening the material of the basket over to provide a slightly flanged formation shown at 34 in Figure 1.

The baskets 33 are formed. from a supply of metallic gauze in sheet formation, the basket being properly shaped and soldered along the seam shown at 35 and also at the bottom as shown at 36.

Inasmuch as the flow of fluid from the casing A will be through the opening I5, and then through the filtering baskets, passing from the outside to the inside thereof,- and continues through the recess 22 and openings I9 and I1, it

. is necessary to provide bracing means to prevent collapse of the walls of the basket 33. This bracing means takes the form of a leaf member shown at 31, which is inserted interiorly of the baskets. This bracing member is shown in detail in Figure '7. Naturally, its shape may be varied with baskets of different size and contour.

The mode of functioning of the above described straining device is thought to be obvious. However, it may be briefly outlined by noting that the casing A and cover 20 are assembled with the base plate B having its several depending baskets extending into the casing A. The threaded openings I4 and H are now connected to the proper conduit to include the strainer in the line of flow of some fluid, such as oil, which is being supplied under pressure. The oil from the line will pass through the opening I5 and substantially fill the casing A, passing through the walls of the several baskets 33 to the interior thereof and being strained thereby. The oilthen passes through the openings 3I and 32 in the top of the central portion 29 to the base plate B, whereupon it continues on through the recess 22 and openings l9 and I I to the oil conduit which is connected to the opening I1. I

. It is clearly evident that theseveral baskets 33, when taken collectively, provide a large area of straining surfaces. If, from continued usage, these surfaces become clogged, the baskets may be removed and cleaned, the usual manner being by removing the cover of the base plate.

Referring now more particularly to Figures 3 and 4, a somewhatmodified form of the invention is shown. In this embodiment, the central portion 29 of the base plate B is provided with a plurality of openings 38 which 'are'in an elongated elliptical shape, clearly shown in Figure 3. base plate as shown in Figure 4 are shaped to conform. to-the openings 38. Attention is called to the fact that these baskets have a very narrow edge which is disposed in the path of the flow of the fluid and the side walls of the basket which diverge backwardly to this edge, serve to diffuse the fluid so that the filtering action -is distributed over the major portions of the walls of all the baskets. If it were not for this arrangement it might be that these portions of the filtering baskets closest to the opening I! might do a considerably greater amount of the filtering than would the remainder of the walls and therefore become. clogged much sooner.

In the form of the invention shown at Figures 3 and 4, I show the baskets 39 as used in conjunction with the outer cylindrical basket 40, and may be anchored to the circular wall 30 of the base plate B in the usual manner. If this basket 40 is availed of, the mesh of its straining medium is preferably larger in size than that of the inner-baskets 39. 1

Referring now to Figures 5 and 6, another form of the invention is shown in which the base plate B is provided with a central oifset portion The, baskets 39 which depend from the i 4| that is substantially rectangular in shape. This offset portion 4| is provided with elongated openings 42 from which depend filtering baskets designated 43 in Figure 6. affixed to the offset portion 4| in the manner above described. If it is desired, the baskets 43 may be covered with a fabric casing designated 44 which also provides filtering effects as the fluid passes therethrough to the interior of the basket. This fabric may be cotton and is removably affixed to the baskets so that it may be replaced when occasion demands.

The mode of use of the form shown in Figures 3 to 6 inclusive, is substantially the same as that described in connection with the form shown in Figures 1 and 2. In the event the fiuid should pass through the strainer in a reverse direction, that is into the baskets at their open end and through the walls thereof outwardly, then the use of the bracing member 31 may be dispensed with.

While preferred specific embodiments of the invention are hereinbefore set forth, it is to be understood that I am not to be limited to the exact constructions illustrated and described, because various modifications of these details may be provided in putting the invention into practice within the purview of the appended claims.

I claim:

1. In a straining device of the character described, a filter basket having parallel side walls These baskets are spaced apart a relatively slight distance and joined by end walls to provide a narrow filter basket, and means for preventing collapse of the said basket consisting of a narrow strip of metal of a zigzag formation and having side edges in engagement with the said parallel walls throughout the entire length of said side edges, said zigzag member having bends defining the zigzag formation spaced from the said end walls of the basket.

2. A strainer of the character described comprising a plate formed with a plurality of narrow openings, a coiresponding number of filter baskets connected to the plates at the openings and having a cross sectional formation corresponding to the shape of said openings, each of said filter baskets having spaced parallel side walls connected by curved end walls, a bracing element in each of said baskets having one end disposed adjacent to the upper end of the basket and its lower end disposed adjacent to the lower end of the basket, said bracing element extending in a zigzag manner throughout the length of the basket and having side edges engaging the parallel walls of the basket to prevent collapse thereof, said bracing member having bends adjacent to but spaced from the curved end walls to permit of circulation of the fluid being strained throughout the basket.

WALTER CZARNECKI. 

